General Vaping Discussion

Hello, I started vaping yesterday. I am not convinced that I should 'top up the juice as and when I can see it finish'. Looking to get good flavor and to extend the coil life as much as possible.

With my basic understanding, if the cotton is not soaked in juice then the wic/coil is going to burn the cotton, right ? So based on that, my understanding is I should top up my juice when the juice reaches the top most line in this pic.
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When to top up juice?

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